AgX(Cl,Br)-TiO_2复合材料光电化学研究  

Photoelectrochemical Properties of AgX(Cl,Br)-TiO_2 Heterojunction Nanocomposites

作　　者：张亚萍 张安玉 于濂清 董开拓 李焰[2] 郝兰众 

机构地区：[1]中国石油大学(华东)理学院新能源物理与材料科学重点实验室,青岛266580 [2]中国石油大学(华东)机电学院,青岛266580

出　　处：《无机材料学报》2016年第3期269-273,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(21476262);青岛市科技发展计划(14-2-4-108-jch);中央高校基本科研业务经费(R1510059A;14CX05038A)~~

摘　　要：以阳极氧化法制备的高度有序TiO_2纳米管阵列作为基底,用沉积法在TiO_2纳米管上复合Ag Cl和Ag Br纳米颗粒形成Ag X-TiO_2异质结。采用XRD、FESEM等分析结果表征,结果表明:Ag Cl以厚度为50 nm、长度为1?m的片状结构堆叠分布,Ag Br的沉积过程较温和,沉积速度相对更慢,均匀分散在TiO_2纳米管表面;随着沉积次数增加,纳米管阵列表面形貌发生改变。光电化学研究表明:样品经过复合Ag Br后,可以有效提高TiO_2纳米管阵列的光电转化效率,当Ag Br沉积1次时,其光电转化效率达到2.67%,而复合的Ag Cl对于TiO_2纳米管阵列的光电效率改善效果欠佳。Sunlight-driven photoelectrochemical water splitting into hydrogen and oxygen presents a great way to develop green solar energy. Titanium dioxide is believed to be one of the most stable photoanode materials. Here, ordered TiO2 nanotube arrays were prepared by anodic oxidation method. Then Ag Cl or Ag Br were successfully deposited on TiO2 nanotube arrays by dipping method. The morphology and crystal structures of Ag X-TiO2 heterojunctions were tested by X-ray diffraction（XRD） and field emission scanning electron microscopy（FESEM）. The results showed that Ag Cl was deposited with 50 nm thickness and 1 μm length structure, while Ag Br can be evenly dispersed on surface of TiO2 nanotube arrays. Ag X amount increased with extending impregnation recycling time, and formed different surface morphology of nanotube arrays. Electrochemical test indicated that suitable amount of Ag Br in the TiO2 nanotube arrays improved the photoelectrochemical properties, an optimum photoconversion efficiency obtained at 2.67%. Excess deposited Ag X will lead to incompletely utilizing sunlight due to blocked nanotube arrays, and result in lower photoconversion efficiency.

关 键 词：阳极氧化法 二氧化钛纳米管 卤化银 光电化学 

分 类 号：TG146[一般工业技术—材料科学与工程]